[FEATURE REQUEST] Allow changing path display type of external tabline tabs

[ryancog]

Essentially, I want to be able to use the Workspace Sidebar's PathStyle configuration option for the Tabline, I'd prefer to just have the name version of the display, as you can have for the Sidebar as follows:

## This setting sets the format of the path string ~~of CWD~~ of the filename in the ~~sidebar~~ tabline.
##  name: filename
##  full: /path/to/filename
##  minimum: /p/t/filename
PathStyle = "name"

Though currently it seems the default (and only) option is what would be called minimum for the sidebar.

Let me know if any further clarification is needed :)